CN104265471A - Combustion mode control system of gasoline premixing and diesel igniting engine and control policy thereof - Google Patents
Combustion mode control system of gasoline premixing and diesel igniting engine and control policy thereof Download PDFInfo
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- CN104265471A CN104265471A CN201410366894.6A CN201410366894A CN104265471A CN 104265471 A CN104265471 A CN 104265471A CN 201410366894 A CN201410366894 A CN 201410366894A CN 104265471 A CN104265471 A CN 104265471A
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Abstract
The invention discloses a combustion mode control system of a gasoline premixing and diesel igniting engine and a control policy thereof. After an electronic control unit acquires the cooling water temperature, the air inlet temperature, the air flow, the engine crankshaft rotating speed and the accelerator pedal position information to judge the operating conditions of the engine, action commands are sent to a gasoline injector and a diesel injector to control the combustion mode of the engine; the operation steps are as follows: (a) the automobile operation state is judged; and the corresponding engine combustion mode is selected; (b) the engine load state is judged, and the corresponding engine combustion mode is selected; and (c) when the engine is positioned in the working condition of medium load, the engine combustion mode is selected. The dynamic performance and the economic performance of automobiles are guaranteed; and the nitric oxide and PM discharge indexes are reduced.
Description
Technical field
The present invention relates to a kind of engine combustion mode control system and control strategy, especially a kind of gasoline premix, diesel oil ignited engine combustion mode control system and control strategy, belong to technical field of internal combustion engines.
Background technique
Along with the development of automobile industry, people focus on emission performance and the economic performance of automobile more, in order to meet the emission regulation demands of increasingly stringent, current motor car engine carries out the process of effulent mostly by means of " exhaust gas purification equipment ", therefore the function of " exhaust gas purification equipment " is by constantly perfect, and its structure is also more and more complicated simultaneously, and particularly it needs to consume a large amount of precious metals, cause price to be approximately the 40-90% of former motor cost, greatly improve the manufacture cost of vehicle.
In order to improve discharge and the economic performance of motor car engine, HCCI(homogeneous charging compressing ignition) technology and gasoline premix, diesel oil ignited (Dual-fuel) technology be subject to the favor of domestic and international automobile industry.Air and fuel oil premixing in gas handling system in the petrol engine that have employed HCCI technology, form the air/fuel mixed gas of homogeneous, then mixed gas is inhaled into cylinder and compresses, in compression stroke, mixture temperature raises, and reaches spontaneous ignition temperature and spontaneous combustion.The distinguishing feature of HCCI technology is that combustion temperature is low, few to the heat transfer of chamber wall, can reduce photothermal transmission, significantly can also reduce the formation of oxynitrides.But HCCI pattern Yin Wendu is uncontrollable, and reactive rate is too fast, in-cylinder pressure rise rate is large, there is fire control system more difficult, is subject to boundary conditions variable effect, running on the lower load combustion instability, high load operating mode roughness noise, the shortcomings such as range of operation is narrow.
Gasoline premix, diesel oil ignited (Dual-fuel) technology can improve internal combustion engine thermal efficiency and reduce exhaust emissions index, make it be rapidly to product and practical technique to transform, rely on gasoline premix, the duel fuel engine of diesel oil ignited (Dual-fuel) technology arises at the historic moment.But, existing gasoline premix, diesel oil ignited motor are only provided with a kind of pattern of double fuel mixed combustion when moderate duty operating mode, such as application number be 201210175963.6 Chinese patent application file disclose a kind of gasoline premix, diesel oil ignited motor and controlling method thereof, its controlling method is: main control unit receives the information that collects of information acquisition unit; According to the various information received, main control unit judges which kind of operating mode motor is at present, simultaneously according to engine operating condition, main control unit selects corresponding ignition way to make engine operation.Although the technological scheme of this patent application effectively can reduce oil consumption and reduce the discharge of harmful matter, but in the technological scheme of this patent application, when motor is in moderate duty operating mode, configured to use only " gasoline premix, diesel oil ignited " a kind of double fuel mixed combustion mode, and under moderate duty operating mode, according to HCCI combustion mode, engine thermal efficiency and exhaust index are all lower, have impact on giving full play to of engine energy-saving emission reduction effect.
Summary of the invention
The object of the invention is to the drawback for prior art, there is provided a kind of grade within the engine that selective " gasoline premix, diesel oil ignited " and HCCI two kinds of combustion modes are set under load condition, power performance and the economic performance of vehicle can be ensured, gasoline premix, diesel oil ignited engine combustion mode control system and control strategy that nitrogen oxide and PM exhaust index reduce can be made again.
Problem of the present invention realizes with following technical proposals:
A kind of gasoline premix, diesel oil ignited engine combustion mode control system, comprise electronic control unit (i.e. Engine ECU), intake air temperature sensor, air flow sensor, cooling-water temperature sensor, engine crankshaft rotation speed sensor, accelerator pedal position sensor, gasoline ejector and diesel injector, described intake air temperature sensor, air flow sensor, cooling-water temperature sensor, engine crankshaft rotation speed sensor, accelerator pedal position sensor is connected with electronic control unit signal input part, described gasoline ejector, diesel injector is connected with electronic control unit signal output part, described electronic control unit is provided with the combustion mode control module with motor moderate duty Conditions Matching, for realizing " gasoline premix, diesel oil ignited " and the switching of HCCI two kinds of combustion modes.
Above-mentioned gasoline premix, diesel oil ignited engine combustion mode control system, described diesel injector is connected with motor diesel oil oil feed line, they are arranged on the top of engine cylinder-body firing chamber, described gasoline ejector is connected with engine gasoline oil feed line by gasoline oil rail, and gasoline ejector and gasoline oil rail are arranged on engine intake manifold.
A kind of gasoline premix, diesel oil ignited engine combustion mode control strategy, after gathering cooling water temperature, intake temperature, air mass flow, engine crankshaft rotating speed and accelerator pedal position information by electronic control unit, the operating conditions of motor being judged, action command is sent to gasoline ejector and diesel injector, control the combustion mode of motor, its operating procedure is as follows:
A, judge travel condition of vehicle, select corresponding engine combustion mode:
Electronic control unit judges travel condition of vehicle according to intake temperature and cooling water temperature information, when vehicle is in starting a cold engine state, motor enters " gasoline premix, diesel oil ignited " pattern or diesel combustion pattern, after vehicle is in normal operating condition, judge engine load state further according to air mass flow, engine crankshaft rotating speed and accelerator pedal position information;
B, judge engine load state, select corresponding engine combustion mode:
When motor is in running on the lower load, motor enters " gasoline premix, diesel oil ignited " pattern or diesel combustion pattern, when motor is in moderate duty operating mode, motor enters " gasoline premix, diesel oil ignited " or HCCI combustion mode, when motor is in high load operating mode, motor enters diesel combustion pattern;
When c, motor are in moderate duty operating mode, the selection of engine combustion mode:
Electronic control unit is according to cooling water temperature, intake temperature, air mass flow, engine crankshaft rotary speed information, and with the calibration value comparison be arranged in electronic control unit, whether the mixed gas judging to enter engine chamber meets the condition of gasoline homogeneous compression-ignition, if meet gasoline homogeneous compression-ignition condition, motor enters HCCI pattern, if do not meet gasoline homogeneous compression-ignition condition, motor enters gasoline premix, diesel oil ignited pattern.
Above-mentioned gasoline premix, diesel oil ignited engine combustion mode control strategy, in step c, when motor is switched to HCCI pattern, from the upper circulation switched, the injection timing that electronic control unit controls diesel oil enters to top dead center pusher, and diesel oil fuel injection quantity is reduced gradually, gasoline spraying oil mass is had increased slightly, when in engine chamber, mixed gas meets gasoline compression ignite condition, engine compression strokes, by mixed gas compression ignite, completes gasoline HCCI combustion process.
Above-mentioned gasoline premix, diesel oil ignited engine combustion mode control strategy, in step c, after motor is switched to HCCI pattern, spray into a certain amount of diesel oil in the combustion reaction later stage, the combustion reaction that next is circulated starts front cylinder temperature and meets gasoline homogeneous compression-ignition condition.
Above-mentioned gasoline premix, diesel oil ignited engine combustion mode control strategy, in step c, after motor is switched to HCCI pattern, by regulating suction pressure and amount of exhaust gas recirculation, reach the effect of the continuous operation of HCCI pattern.
The present invention is provided with the combustion mode control module with motor moderate duty Conditions Matching in electronic control unit, achieve " gasoline premix under motor moderate duty operating mode, diesel oil ignited " and the switching of HCCI two kinds of combustion modes, when electronic control unit is according to cooling water temperature, intake temperature, air mass flow, engine crankshaft rotary speed information, and with the calibration value comparison be arranged in electronic control unit, after judging that the mixed gas entering engine chamber meets the condition of gasoline homogeneous compression-ignition, motor enters HCCI pattern, vehicle is not only made to maintain good power performance and economic performance, make nitrogen oxide and PM emission level reduce simultaneously, the present invention in an hcci mode, the combustion reaction later stage makes next circular response start front cylinder temperature to meet gasoline homogeneous compression-ignition condition by spraying into appropriate diesel oil, and by regulating suction pressure and amount of exhaust gas recirculation, reach the effect of the continuous operation of HCCI pattern, the present invention utilizes adjustment to diesel oil fuel injection quantity, and overcome HCCI combustion mode temperature uncontrollable, reactive rate is too fast, and in-cylinder pressure rise rate is large waits harmful effect, expands the application area of HCCI combustion mode under motor moderate duty operating mode.In a word, the selection of the present invention " gasoline premix, diesel oil ignited " and HCCI two kinds of combustion modes by waiting within the engine under load condition, not only ensure that power performance and the economic performance of vehicle, and reduces and make nitrogen oxide and PM exhaust index.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is gasoline premix, diesel oil ignited engine combustion mode Control system architecture schematic diagram;
Fig. 2 is gasoline premix, diesel oil ignited engine combustion mode control strategy logic diagram;
Fig. 3 is the area distribution schematic diagram of gasoline premix, the different combustion mode of diesel oil ignited motor.
In figure, each list of reference numerals is: 1, intake air temperature sensor, 2, air flow sensor, 3, cooling-water temperature sensor, 4, engine crankshaft rotation speed sensor, 5, accelerator pedal position sensor, 6, electronic control unit (i.e. Engine ECU), 7, intake manifold, 8, gasoline oil rail, 9, gasoline ejector, 10, diesel injector, 11, engine cylinder-body;
N, engine load, n, engine crankshaft rotating speed.
Embodiment
Referring to Fig. 1, gasoline premix in the present invention, diesel oil ignited engine combustion mode control system comprises electronic control unit 6, intake air temperature sensor 1, air flow sensor 2, cooling-water temperature sensor 3, engine crankshaft rotation speed sensor 4, accelerator pedal position sensor 5, gasoline ejector 9 and diesel injector 10, described intake air temperature sensor 1, air flow sensor 2, cooling-water temperature sensor 3, engine crankshaft rotation speed sensor 4, accelerator pedal position sensor 5 is connected with electronic control unit 6 signal input part, described gasoline ejector 9, diesel injector 10 is connected with electronic control unit 6 signal output part, diesel injector 10 is also connected with motor diesel oil oil feed line, they are arranged on the top of engine cylinder-body 11 firing chamber, described gasoline ejector 9 is connected with engine gasoline oil feed line by gasoline oil rail 8, gasoline ejector 9 and gasoline oil rail 8 are arranged on engine intake manifold 7, described electronic control unit 6 is provided with the combustion mode control module with motor moderate duty Conditions Matching, under realizing motor moderate duty operating mode " gasoline premix, diesel oil ignited " and the switching of HCCI two kinds of combustion modes.
Referring to Fig. 2, gasoline premix in the present invention, diesel oil ignited engine combustion mode control strategy are after gathering cooling water temperature, intake temperature, air mass flow, engine crankshaft rotating speed and accelerator pedal position information by electronic control unit 6, judging the operating conditions of motor, action command is sent to gasoline ejector 9 and diesel injector 10, control the combustion mode of motor, with specific embodiment, its operating procedure be described below:
A, judge travel condition of vehicle, select corresponding engine combustion mode:
Electronic control unit 6 judges travel condition of vehicle according to intake temperature and cooling water temperature information, the intake temperature detected when intake air temperature sensor 1 is lower than 25oC, when the cooling water temperature that cooling-water temperature sensor 3 detects is lower than 75oC, when electronic control unit 6 judges that vehicle is in starting a cold engine state, motor enters " gasoline premix, diesel oil ignited " pattern or diesel combustion pattern; The intake temperature detected when intake air temperature sensor 1 is not higher than 60oC, when the cooling water temperature that cooling-water temperature sensor 3 detects is not higher than 90 oC, vehicle is in normal operating condition, and then judges engine load state further according to air mass flow, engine crankshaft rotating speed and accelerator pedal position information;
B, judge engine load state, select corresponding engine combustion mode:
The engine crankshaft rotating speed that engine crankshaft rotation speed sensor 4 detects is 1000rpm-4000rpm, accelerator pedal position sensor 5 detect by the load of accelerator pedal position demand when 0%-30%, motor is in running on the lower load, motor enters " gasoline premix, diesel oil ignited " pattern or diesel combustion pattern.
The engine crankshaft rotating speed detected when engine crankshaft rotation speed sensor 4 is 1000rpm-4000rpm, when the gas pedal that accelerator pedal position sensor 5 detects is in the load 30%-70% position of demand, motor is in moderate duty operating mode, and motor enters " gasoline premix, diesel oil ignited " or HCCI combustion mode.
The engine crankshaft rotating speed that engine crankshaft rotation speed sensor 4 detects is 1000rpm-4000rpm, when the load that the gas pedal that accelerator pedal position sensor 5 detects is in demand is greater than the position of 70%, motor is in high load operating mode, and motor enters diesel combustion pattern;
When c, motor are in moderate duty operating mode, the selection of engine combustion mode:
Electronic control unit 6 is according to cooling water temperature, intake temperature, air mass flow, engine crankshaft rotary speed information, and with the calibration value comparison be arranged in electronic control unit, judge whether the mixed gas entering engine chamber meets the condition of gasoline homogeneous compression-ignition;
The intake temperature detected when intake air temperature sensor 1 is 25-45oC, the cooling water temperature that cooling-water temperature sensor 3 detects is 75-85oC, the air mass flow that air flow sensor 2 detects infers that the EGR rate is at 30-50%, when the engine crankshaft rotating speed that engine crankshaft rotation speed sensor 4 detects is 1000rpm-2500rpm, meet gasoline homogeneous compression-ignition condition, motor enters HCCI pattern, from the upper circulation switched, the injection timing that electronic control unit 6 controls diesel oil enters to top dead center pusher, and diesel oil fuel injection quantity is reduced gradually, gasoline spraying oil mass is increased, when in engine chamber, mixed gas meets gasoline compression ignite condition, engine compression strokes is by mixed gas compression ignite, a certain amount of diesel oil is sprayed in the combustion reaction later stage, the combustion reaction that next is circulated starts front cylinder temperature and meets gasoline homogeneous compression-ignition condition, simultaneously by regulating suction pressure and amount of exhaust gas recirculation, reach the effect of the continuous operation of HCCI pattern,
When motor is not in above-mentioned condition, do not meet gasoline homogeneous compression-ignition condition, motor enters gasoline premix, diesel oil ignited pattern, in the engine suction stroke stage, the mixed gas of gasoline and fresh air enters in cylinder, the compression stroke stage, diesel oil sprays in budc, diesel oil is after compression ignite, and the gasoline in cylinder is lighted formation multi-point spark by the flame of formation, completes mixed combustion mode.
Referring to Fig. 3, as can be seen from the area distribution schematic diagram of gasoline premix, the different combustion mode of diesel oil ignited motor: after adopting technical solution of the present invention, electronic control unit 6 can select different combustion modes according to present engine load operating mode, its purpose definitely, can give play to the advantage of different combustion mode better.
Claims (6)
1. a gasoline premix, diesel oil ignited engine combustion mode control system, comprise electronic control unit (6), intake air temperature sensor (1), air flow sensor (2), cooling-water temperature sensor (3), engine crankshaft rotation speed sensor (4), accelerator pedal position sensor (5), gasoline ejector (9) and diesel injector (10), described intake air temperature sensor (1), air flow sensor (2), cooling-water temperature sensor (3), engine crankshaft rotation speed sensor (4), accelerator pedal position sensor (5) is connected with electronic control unit (6) signal input part, described gasoline ejector (9), diesel injector (10) is connected with electronic control unit (6) signal output part, it is characterized in that, described electronic control unit (6) is provided with the combustion mode control module with motor moderate duty Conditions Matching, for realizing " gasoline premix, diesel oil ignited " and the switching of HCCI two kinds of combustion modes.
2. a kind of gasoline premix according to claim 1, diesel oil ignited engine combustion mode control system, it is characterized in that, described diesel injector (10) is connected with motor diesel oil oil feed line, they are arranged on the top of engine cylinder-body (11) firing chamber, described gasoline ejector (9) is connected with engine gasoline oil feed line by gasoline oil rail (8), and gasoline ejector (9) and gasoline oil rail (8) are arranged on engine intake manifold (7).
3. a gasoline premix, diesel oil ignited engine combustion mode control strategy, it is characterized in that, by electronic control unit (6) gather cooling water temperature, intake temperature, air mass flow, engine crankshaft rotating speed and accelerator pedal position information, the operating conditions of motor is judged after, action command is sent to gasoline ejector (9) and diesel injector (10), control the combustion mode of motor, its operating procedure is as follows:
A, judge travel condition of vehicle, select corresponding engine combustion mode:
Electronic control unit (6) judges travel condition of vehicle according to intake temperature and cooling water temperature information, when vehicle is in starting a cold engine state, motor enters " gasoline premix, diesel oil ignited " pattern or diesel combustion pattern, after vehicle is in normal operating condition, judge engine load state further according to air mass flow, engine crankshaft rotating speed and accelerator pedal position information;
B, judge engine load state, select corresponding engine combustion mode:
When motor is in running on the lower load, motor enters " gasoline premix, diesel oil ignited " pattern or diesel combustion pattern, when motor is in moderate duty operating mode, motor enters " gasoline premix, diesel oil ignited " or HCCI combustion mode, when motor is in high load operating mode, motor enters diesel combustion pattern;
When c, motor are in moderate duty operating mode, the selection of engine combustion mode:
Electronic control unit (6) is according to cooling water temperature, intake temperature, air mass flow, engine crankshaft rotary speed information, and with the calibration value comparison be arranged in electronic control unit, whether the mixed gas judging to enter engine chamber meets the condition of gasoline homogeneous compression-ignition, if meet gasoline homogeneous compression-ignition condition, motor enters HCCI pattern, if do not meet gasoline homogeneous compression-ignition condition, motor enters gasoline premix, diesel oil ignited pattern.
4. a kind of gasoline premix according to claim 3, diesel oil ignited engine combustion mode control strategy, it is characterized in that, in step c, when motor is switched to HCCI pattern, from the upper circulation switched, the injection timing that electronic control unit (6) controls diesel oil enters to top dead center pusher, and diesel oil fuel injection quantity is reduced gradually, gasoline spraying oil mass is increased, when in engine chamber, mixed gas meets gasoline compression ignite condition, engine compression strokes, by mixed gas compression ignite, completes gasoline HCCI combustion process.
5. a kind of gasoline premix according to claim 4, diesel oil ignited engine combustion mode control strategy, it is characterized in that, in step c, after motor is switched to HCCI pattern, spray into a certain amount of diesel oil in the combustion reaction later stage, the combustion reaction that next is circulated starts front cylinder temperature and meets gasoline homogeneous compression-ignition condition.
6. a kind of gasoline premix according to claim 5, diesel oil ignited engine combustion mode control strategy, it is characterized in that, in step c, after motor is switched to HCCI pattern, by regulating suction pressure and amount of exhaust gas recirculation, reach the effect of the continuous operation of HCCI pattern.
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| CN112368470B (en) * | 2018-07-04 | 2023-03-10 | 瓦锡兰芬兰有限公司 | Method for increasing load in four-stroke internal combustion engine |
| CN111749796A (en) * | 2020-05-14 | 2020-10-09 | 吉利汽车研究院（宁波）有限公司 | Fuel supply method, device, electronic equipment and storage medium |
| CN113914974A (en) * | 2020-07-08 | 2022-01-11 | 长城汽车股份有限公司 | Method and device for reducing emission of nitrogen oxides and automobile |
| CN113914974B (en) * | 2020-07-08 | 2023-02-03 | 长城汽车股份有限公司 | Method and device for reducing emission of nitrogen oxides and automobile |
| CN114370334A (en) * | 2020-10-14 | 2022-04-19 | 比亚迪股份有限公司 | Engine cleaning method and cleaning system for hybrid vehicle and hybrid vehicle |
| CN114370334B (en) * | 2020-10-14 | 2023-09-05 | 比亚迪股份有限公司 | Engine cleaning method and system for hybrid vehicle and hybrid vehicle |
| CN114738095A (en) * | 2022-05-09 | 2022-07-12 | 潍柴动力股份有限公司 | Engine emission control method, device, equipment and storage medium |
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